Thanks to their iron coating they could not perforated by the artillery's of that time, which could only damage non vital point of them like smokestacks, steerage and embrasures. Furthermore their draught was very little, so that they could manoeuvre
also in relative shallow waters.
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The monitor vs. Merrimack took place in 1862.
Ironclads.
If the question asks only about the crews of the two ships, the Monitor had a crew of 59, and the Merrimack had 320, but the entire two-day Battle of Hampton Roads involved thousands more. The Merrimack was joined by five CSN gunboats, and there were five USN warships at Hampton Roads. [The Merrimack sank two of them before the Monitor arrived.]
merrimack monitor
The Merrimac,